Charity number 265239 SolHtng4 Solar Heating Worksheet - water and buildings Take a walk to the solar water heating display in the middle of the site, near the wind and water power displays. Inside the display there is a sink on the right and a large tank to the right of it. This tank is only heated from the three panels above it on the roof (to the right of the roof). The smaller tank at the front has been cut open to show how the hot water from the panel passes through the tank in a copper pipe. How hot is the water from the tap in the sink? You might need to run the tap for a bit to get rid of the cold water in the pipe. The temperature is affected by a number of factors: what time of day is it? what time of year is it? how sunny has it been today? how sunny was it yesterday? how many visitors do you think have come round today and used some of the hot water? Given all these factors is the water hotter or colder than you’d expect? (When it is quite sunny the water heated by the sun has to be mixed with some cold water so that it does not burn visitors’ fingers). The system has a pump – why? What do the electronic controls do? Outside, the panel with the kettle has a thermometer attached. What is the temperature? Charity number 265239 SolHtng4 To the left of that panel there are four small panels with thermometers above (under flaps that lift up). What are the temperatures? Metal (white) metal (black) insulated behind glazed & insulated On average in Britain people could get half their hot water from solar energy over the course of a year (not for central heating but showers, washing up and all the other uses of hot water). What do you think this pattern of solar heated water production would be like over the year? Materials used in the solar water heating systems Why have the following materials been used in this display – Copper pipe inside the tank Foam on the outside of the tank Metal panel inside the panel with the kettle attached Glass on the front of the panel Rockwool in the panel made from an old radiator Is there a suitable place on your home to put solar water heating panels? If so, where and why? Charity number 265239 SolHtng4 Passive solar heating of buildings Passive solar heating means designing buildings so that solar energy can get in easily to heat up the space inside. Ideally it also means trying to store the heat for as long as possible while making sure that the building will not overheat. Look at the Self-build house and describe how it uses passive solar energy (and loses excess heat). Look at the shop and describe how it uses passive solar energy (and loses excess heat). The earth walls hold the building up but they also have a useful function on the passive solar heating system. How? What makes passive solar buildings pleasant to be in?
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